Molding-flask



G. W. CANNON.

MOLDLNG- FLASK.

APPLICATION FILED. APR. 12,..1920.

Patohted May 3, 1921.

' GEORGE W. CANNON, OF MUSKEGON, MICHIGAN-a MOLDING-FLASK.

Specification of Letters Patent.

Patented May 3, 1921.

Application filed April 12, 1920. Serial No. 373,057.

To all whom it may concern:

Be it known that I, GEORGE W. CANNON,

a citizen of the United States of America,

residing at Muskegon, in the county of Muskegon and State of Michigan, have invented certain new and useful Improvements in Molding-Flasks; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use thesame.

This invention relates to improvements in molding flasks such as are used in foundries. Such flasks ordinarily include upper and lower parts known as the drag and the cope respectively, and the same, when a mold is completed, are located the one under the other and are usually held against lateral displacement by guide pins associated with ears, a plurality of which project from both the drag and the cope and which are adapted to lie with the ears of the cope over those of the drag. In modern practice, the old wooden flasks have been largely replaced by steel or iron flasks and the ears are formed integral with the drag and the cope. When the ins are formed integral with said ears on til oif and cannot be easily replaced.

It is a primary object and purpose of the present invention to make an improvement in these flasks which will permit the ready removal of the guide pins after they have served their purpose of guiding the cope into the proper position w1th respect to the drag, and to so construct the flask parts that, after the pins have been removed, thecope cannot move laterally and in this way destroy the mold so that a good castin cannot be made. To this end I have ma e the construction illustrated in the accompanied drawing, in which:

Figure 1 is a fragmentary elevation and sectional view showing a flask equipped with myinvention two associated ears on to the drag and the cope being shown in section with my invention applled thereto.

Fig. 2 is an elevation of a removable guide pin, and I Fig. 3 is a vertical section taken. through the bushing o-r sleeve with which the pin is detachably connected.

Like reference characters refer to like parts in the different parts of the drawing.

The drag of the flask is indicated at 1 and e drag, they are very liable to be broken is placed on a level surface and the drag the cope at 2. Adjacent the upper edges of the drag and at a plurality of points around the same outwardly pro ecting ears 3 are 1 formed and in a metal flask these ears are-integral with the drag. Likewise adjacent the lower edges of the cope 2 similar ears 4 are made and are so constructed that when the cope is placed above the drag an ear t comes directly above an ear 3. Each of the ears 3. has a vertical opening made therein in which a bushing '5 is secured, preferably,

by pressing the same therein. This bushing has a central vertical cylindrical opening 5" through it; the bushing extends slightly below the lower side of the ear 3 and a distance above the side of the ear as shown.

Each of the ears 4 on the cope 2 has a cylindrical opening 6 made vertically therein and of a dimension just suflicient toreceive the bushing or sleeve 5. A plurality of pins 7 with depending smaller projections 8 are used, said projections being of a size to readily enter a vertical opening 5 in a bushing 5. The pins 7 at their lower portions are of the same diameter as the outer diameter of the bushings 5 for a short distance and thence taper upwardly.

In the operation of molding, the pattern projections 8 being passed through the bushings After the cope is placed against the drag it 1s evident that the guide fingers will carry it to a certain position .and hold it there after which the mold may be completed by filling, ramming and venting the cope in the usual manner. The cope is then removed and the pattern drawn, and the proper ways to conduct the molten metal to the openings left by the pattern made, after which the cope is again placed upon the drag, being guided into exactly the same position that it occupied before by said guide pins 7. The guide pins may then be removed. The cope cannot move laterally with respect to the drag by reason of the upward projection of the bushings 5 through the openings 6 in the ears 4. In practice the ears 4 may be about one inch in thickness and the bushings 5 extend above the ears 3 about three-fourths of an inch.

With this construction of flasks not only are the guide pins 7 safe guarded against breakage from which a practical destruction of the flask for molding purposes follows, but the removal of said pins does not affect; the drag or cope so that one can move with respect to the other. It is evident that with said fingers attached'permanently to either the ears 3 or 4 breakage isvery liable to occur and with my invention this possibility is eliminated. Moreover, the fingers are more or less in the way particularly with the large flasks in which, in many instances, said fingers are better than ten inches long. The invention is very ractical and efiicient and has proved satis actory in every respect after continuous use of the same for a considerable period of time.

Various changes in minor detail of construction may be resorted to without departing from the invention. For instance, while I have described the drag and cope as having projecting ears 3 and 4, it is evident that such drag and cope may be made with outwardly projecting continuous flanges in which the ears are included, and that the removable pins and the permanently connected bushings need not necessarily be together as shown in order to perform their functions. Accordingly, I do not wish to be limited to the exact and specific'construction shown and described, but consider myself entitled to all modifications falling within the scope of the appended claims defining the invention.

I claim:

1. In a molding flask, a drag and co e, each having ears extending therefrom ocated so that the ears of the cope come against and directly above those of the drag, a bushing permanently connected with and extending through eac ear of the drag and pro'ecting a distance above said ear, said bus ing having a vertical opening therethrough, said ears on the cope being provided with vertical openings therethrough of a size so that the bushing may just enter the same, and a guide pin comprised of an upper portion, the lower part of which has the same diameter as the outside diameter of the bushing and tapers upwardly therefrom, and a lower portion adapted to enter the opening in the bushing and center the pin with respect to the bushing, one of said guide pins being used with each car on the drag, substantially as and for the purposes described.

2. In a molding flask, a cope and a drag adapted to be placed one on the other, ears extending from each adapted to lie one over the other, guide pins detachably connected one to each ear on the drag and extending upwardly therefrom, said pins tapering up- -Wardly and said ears on the cope having hold the flask parts against movement laterally with respect to each other when the pins are removed, said pins being freely removable after the cope has been guided to place thereby on the drag, substantially as described.

3. In a molding flask containing a drag and cope, the latter of which is adapted to be placed over the former, ears projecting from the 'said drag and cope at their adjacent upper and lower edges, a bushing having a central vertical opening therein fixed to each ear on the drag and extending a distance above said ear, and a pin removably connected to said bushing and projecting'upwardly therefrom, said pin where it bears against the bushing having the same outside diameter as the bushing, substantially as described.

4. In a molding flask, a drag and a cope adapted to be located one under the other, each being formed with outwardly projecting portions at the adjacent meeting edges thereof, a guide pin detachably connected to and extending upwardly from each projecting portion on the drag, said adjacent portions on the cope having openings through which the guide pins may pass, and means on each of said projecting portions on the drag projecting upwardly a short distance therefrom to engage with the similar portions on the cope and hold the drag and cope against movement with respect to each other when the guide pins are removed, said pins being freely removable after the cope has been guided to place thereby on the drag, substantially as described.

5; In a molding flask, a drag having outwardly projecting ears at its upper edge, a vertically disposed bushing permanently secured to each ear and passing therethrough, each of said bushings having a central vertical opening through it and extending a short distance above its associated ear, and a guide pin detachably connected with each bushing and extending upwardly therefrom, the diameter of the guide. pin where it bears against the bushing being the same as the outer diameter of tially as described.

In testimony whereof I aflix my signature.

GEORGE W. CANNON. 

